发布时间:2025-01-30 10:34:10
一般就是说质量,s1一般指环刚度4kn,
s2一般指环刚度8kn。但是好多厂子出的企标管子到不了
我想在瓷砖地上把一些圆柱体垒成三角形可是怎么也不行 地太滑了怎么办
2025-01-30 10:34:10我要加工内孔11mm的有机玻璃孔深度有180mm内孔要镜面透明怎么样抛光或加工
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